Wire pulling jack



1954 E. J. DULLAGHAN 2,670,016

WIRE PULLING JACK Filed April 19. 1951 2 Sheeqs-Sheet 1 IN VEN TOR. falmfia J 011,467??? 1954 E. J. DULLAGHAN v 2,670,016

WIRE PULLING JACK Filed April 19, 195]. 2 Sheets-Sheet 2 Patented Feb. 23, 1954 UNITED STATES PATENT OFFICE 4 Claims. (Cl. 140123.5)

ing the pulling action on the wire and by providing means in the jack for maintaining the fluid therein in effective position at all positions of the tool.

Further objects are to provide an effective gripping means for gripping the extremities of the wire, and to provide an easily operated twisting device which will form a tight locking twist in the wire without burning, breaking, or damaging the wire.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efficiency. These will become more apparent from the following description.

In the following detailed description of the invention, reference is has to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawings:

Fig. 1 is a top view of the improved concrete form wire pulling and tying tool as it would appear with a wire in place therein ready for use;

Fig. 2 is a side view thereof;

Fig. 3 is a longitudinal, horizontal section, taken on the line 3-3, Fig. 2;

Fig. 4 is a fragmentary, front view thereof;

Fig. 5 is a fragmentary, detail section, taken on the line 5--5, Fig. 3;

Fig. 6 is a similar section, taken on the line 6--5, Fig. 3; and

Fig. '7 is a cross-section through a wire tying head used on the improved tying tool, taken on the line 1-1, Fig. 3.

In the drawing a typical concrete form has been indicated at In, with one of its supporting batten strips at H and form-typing wires at l2.

The invention is designed to apply tension to the wires l2 and to twistthe extremities eLU thereof together to form a tying twist [3. The improved tool is built about a supporting frame member i4 provided with a downwardly depending handle socket I5 into which any suitable handle It may be inserted, if desired.

A cup-like fluid reservoir I1 is threaded onto a receiving boss It on the frame member ll. The reservoir contains a valve block i9 secured against the closed extremity thereof by means of a tubular, threaded stud 29 and a clamping nut 2|.

An actuating cylinder 22 extends through the frame member is and is threaded into the valve block 19 within the reservoir 11. A power pis ton 48 is slidable within the cylinder 22. Fluid is pumped from the reservoir into the actuating cylinder by means of a pump plunger 23 operating in a pump cylinder 24. The pump cylinder 24 extends from the frame member 14 to the valve block l9 parallel to the actuating cylinder 22, and the plunger '23 extends to the exterior through a suitable packing nut 25. As the plunger 23 is moved outwardly, it acts to draw fluid from the reservoir through an intake port 28 and through a return check valve ball 21, and as the plunger 23 is moved inwardly, the check valve ball 21 opens, and a second check valve ball 29 opens, allowing the fluid to enter the cylinder 22 through an intake port 30. The ball 27 is urged against its seat by means of a spring 23, and the second check valve ball 29 is constantly urged toward a seat bushing 3! by means of a second spring 32.

The plunger 23 is reciprocated by means of an L-shaped pump lever 33 rotatably mounted in supporting ears 34 extending forwardly from the frame member Hi. The pump lever 33 terminates in a crank member 35 which is connected with the plunger 23 through the medium of a suitable crank pin 36. The pump lever 33 may be provided with a convenient hand grip 31. Thus, it can be seen that as the grip 31 is moved forward and back, the pump plunger will be moved forward and back at reduced speed and increased leverage.

A safety valve ball 87 is held in place against a retaining spring in the threaded stud 20 by means of a threaded plug 39. The ball 8'! is set to release at any desired, predetermined pressure. The fluid released by the .safetyvalve returns through a return channel 88 to the reservoir H.

leasing lever 38 which is also rotatably mounted .in theears 34, The lever 38 carriesareleasing cam 39 positioned to contact a valve push rod 40 which acts to force a stop valve ball 4| from its seat against the action of a third valve spring 42.

A compression spring 43 acts against a set collar 44 on the rod 40 to constantly urge the latter against the cam 39. Leakage around the rod 40 is prevented by means of a suitable gland nut 45. It can be seen that if the releasing cam 39 is turned to the position of Fig. 5, the pressure in the actuating. cylinder 22 will be released .and the fluid-therein will flow back to the fluid reservoir ll.

Since it is necessary to use the device in all positions, it is essential that some means. be.pro-,-

vided for maintaining the fluid about the pump cylinder 24.

This is accomplished by. placing: an inflatable air bag 4'6 in the reservoir which. can be inflated with air through an air valve 41",

with two diametrically opposite, wire-receiving passages 86, the outer walls of which are substantially parallel to the axis of the head. The inner walls of the passages 86, indicated at 68, are arcuately inclined inwardly, as shown in Fig. 3, and terminate in a round, countersunk, twist-receiving cavity 99. The rear extremity of the twisting head is surrounded by a circular ratchet flange l3 provided with peripheral ratchet: notches 14.

An annular ratchet' yoke IB -surrounds the flange 13. The ratchet yoke 15' is held in place about the notched ratchet flange 13 of the head by means of a circular back plate 12 and an 'annular front plate 16, which are secured to thee yokealihby means of suitable screws 11. The yoke 15 is provided with a ratchet handle I 'TBhaving a pawl cavity 19 in which a ratchet which may be similar to the usual valves. used;.

on pneumatic tires. As;fluid is drawn from the reservoir l-l, thepressure .withinthe bag 46..wi-ll cause the bag. to expand and prevent the formation of a. voidin the reservoir. Whenfluid. is returned-to thereser-voir, theair intheinflated bag willacompress, allowing the bag to contract. Therefore-regardless of .the position of the. tool, the intake port 25. of. the pump cylinder 24. will always be immersed in-fluid.

The power piston 48. is mounted on the. ex-. tremity of asquare-piston-rod 49 whichex-tends fromrthecylinder through a square opening in a-.cy-linderhead 50. The cylinder head 59 is mounted-onithe forward extremity of a rotatable wire-gripping member 5! by means of suitable mounting screws 52. The wire-grippingmember St is counter-bored to-rotatably receivea retaining. ring -5 3 WhlCh; is threaded on.the extremity of the actuating cylinder 22. A fluid sealing disc SAzis-clamped between the-head 50 and theend of-.thecylinder. The gripping member 5!. is thereby held in place by the retaining ring .53, but-is.freelyrotatable about the actuating cyl inder"22-..

Thegr-ipping member 51 carries a transversally-.-extending,. lower dogv shaft 55 on each extremity ofwhich. a lower ratchet. dog 56 is mounted. A sideplate 51 is secured onreach ex.- .tremityofthe shaft 55 by means of retaining screws-58 threaded into the extremities of the shaft. The shaft SS-ispositioned below the axis of the piston rod 49;. A transverse, eccentric shaft 59 is journalled in.thewirergrippingmember..5l .above the axis of. the rod 49 and is provided. with-a .grip clampin Wheel 60;. An eccentric-crankstub 61. projects from the eccentric shaft- 59. .upon..which.two upper ratchetdogs' 62 are..mounted.. The adjacent faces of' the two pair-sci. dogsareprovidedwith ratchet-like gripping..teeth 6 3 for gripping the. extremities of the Wire [2.

' A third. retaining screw (it is threaded into the extremity of. the eccentric stub 6i to assist in' holding the side plates 57 and the dogs in place. The side plates 51 are movable with the eccentric action of the stub 61, and are provided withelongated. screw holes 65 to allow for movement' relative to the lower dog shaft 55. The amount of tilting action of the dogs is limited bymeans of limiting pins 66 extending into elongated, arcuate pin holes 61.

A wire-twisting head H is fixedly mounted on the extremity of the piston rod 49 and held 'inplace thereon by means of a suitable retaining 69. A pivot point '16 is inset in the end of rod 49 and projects axially forwarditherei- "Ilie-wire-twistmghead niswprovided pawl-.fifllisimounted on a pawl pivot pin 8|. The pawl is urged into the ratchet notches 74 by means-of. a radial. plunger 32 mounted. against a compression spring- 84'. in. a. rotatable. latch shaft... 83. The latch shaft. extends. through. the frontplate Hi, whereitis provided with. aflnger grip 85.

It. canbe seen thatwhen the latchshaft 83 is swung inone direction, by means of the grip 85, theplunger. 82 will. move away from the-pawl 80,'allowing it to swing. away from. engagement with the notches, 14,, and. when. moved. in the other direction, as shown in Fig. 7,.thepli1nger willswing against the pawl and the spring. 84 will force. the pawl into engagement, with the notches,

Operationv The extremities of the tie-wire l2 are drawn through the form I ll oneachside of the battenzixl; The pivot point 10 is placed against-the batten between the extremities :ofthe Wire, andthe latter are passedthrough the wire-receiving passagesi86 inthe-twisting head T-l', thence between=the twp dogs 56and BZ-"at' each side of'the grippingmember5 I, as'shown-inthe drawing.

The grip clamping wheel 60 is now rotated rearwardly to swing the upper dogs 62rdown- Wardly toward the dogs 5 6 and into grippingrelation with the extremities ofthewire. The pump lever 33 is now-operated to force the actuating cylinder 22 rearwardly along the pistonrod dfl' so as to force the pivot point into the batten and to'increase the-tensionin the wire 12. Whenthe predetermined tension has been reached; the safety valve ball 8? will'rele'aseto prevent further rearward movement. 1

The ratchet handle 18 is now oscillated to intermittently rotate the twisting head 1 1.2 The rotation of the winding head is transmitted through the squarepiston rod- 49 to-the gripping member 5| so that all elements of the tool which are connected to the wire'will rotate around the axis of the-pilotpoint H!- to" form thetwist: l3 in the cavity 90. The advancing twist in-thewire increases the pullupon the actuating "cylinder and consequently tends to increase the flui-dipressure inthe cylinder 22. The pressure increaseis gradually released by the-safety valve b'allfili so that with the proper safety valve setting. the exact tension necesary to produce: a tight, perfecttwist in the wire is maintainedtth'roughouti the: twisting action, and all damage to the wi'rJeis-eliminated.

After thetwist. is completed, the: hand; wheel. 60 isrotated to release the, ratchet dogs from: the wire and the tool? is; with-drawn therefrom;

While axspecifi'c former the improvement-has heemtdescribedsandriilustrated herein-..;it iszto be understood that the same may be varied, within the scope of the appended claims, without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent is:

1. A tool for tightening and tying concrete form tie wires comprising: a frame member; a cup-like reservoir mounted on said frame member and extending rearwardly therefrom; an actuating cylinder mounted in and extending through said frame member and projecting into said reservoir and forwardly from said frame member; a nonround piston rod slidably mounted in said cylinder; means for pumping fluid from said reservoir into said cylinder to force said piston rod forwardly therein; a cylinder head in said cylinder having a non-round opening through which said rod slidably passes; a sleeve rotatably mounted about the forward extremity of said cylinder; means for preventing longitudinal movement of said sleeve with respect to said cylinder; wiregripping members mounted on opposite sides of said sleeve, said sleeve being attached to said cylinder head to rotate therewith and with said rod; and a wire-twisting head fixedly mounted on the extremity of said piston rod and having wire passages in alignment with said wire-gripping means.

2. A tool for tightening and tying concrete form tie wires as described in claim 1 and having yieldable means allowing said sleeve to approach said twisting head as the tension in the wire increases due to the twisting action thereon.

3. A tool for tightening and tying concrete form tie wires as described in claim 2 having means swingingly mounted on said twisting head for imparting intermittent rotation thereto.

4. A tool for tensioning and twisting a concrete form tie wire, comprising: a piston rod; a wiretwisting head fixedly mounted on the forward extremity of said piston rod and provided with two oppositely positioned wire-receiving passages; a pivot point projecting forwardly from said rod; an actuating cylinder surrounding said rod in relatively rotatable relationship; a piston on said rod within said cylinder; means for forcing fluid under pressure into said cylinder against said piston to force said cylinder rearwardly on said rod; means rotatably mounted on said actuating cylinder for attaching the extremities of a form-tying wire thereto, said means being nonrotatable relative to said rod so that the Winding of said wire will act to draw said cylinder forwardly on said rod to increase the fluid pressure in said cylinder; and a safety valve arranged to relieve the pressure in said actuating cylinder when a predetermined pressure has been reached therein to avoid excessive tension in said wire.

EDWARD J. DULLAGHAN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 893,423 Bates et a1 July 14, 1908 1,313,488 King Aug. 19, 1919 1,963,144 OBussa June 19, 1934 2,158,855 Eby et al. May 16, 1935 2,133,887 Beers Oct. 18, 1938 2,214,267 Bednarek Sept. 10, 1940 2,254,613 Matthysse Sept. 2, 1941 2,568,054 Clapp Sept. 18, 1951 

